Fabrication of Transparent La2Zr2O7 by Reactive Spark Plasma Sintering

2011 ◽  
Vol 484 ◽  
pp. 135-138 ◽  
Author(s):  
Li Qiong An ◽  
Akihiko Ito ◽  
Takashi Goto
Keyword(s):  
Grain Size ◽  
Spark Plasma Sintering ◽  
Wavelength Range ◽  
Single Phase ◽  
Sintering Temperature ◽  
Pyrochlore Structure ◽  
Sintered Body ◽  
Plasma Sintering ◽  
Spark Plasma

Transparent La2Zr2O7 with cubic pyrochlore structure was first fabricated by reactive spark plasma sintering using commercially available La2O3 and ZrO2 powders. Single phase of pyrochlore La2Zr2O7 was obtained at a sintering temperature of 1673 K and sintering pressure at 100 MPa for 2.7 ks. The La2Zr2O7 sintered body had a uniform grain size of 1.5 m and exhibited 68% transmittance in the wavelength range of 4–6 m.

Fabrication of Y2Ti2O7 Transparent Ceramic by Spark Plasma Sintering

2021 ◽  
Vol 1035 ◽  
pp. 663-667
Author(s):  
Li Qiong An ◽  
Rong Wei Shi ◽  
Run Hua Fan ◽  
Takashi Goto
Keyword(s):  
Grain Size ◽  
Spark Plasma Sintering ◽  
Pyrochlore Structure ◽  
Transparent Ceramic ◽  
Sintered Body ◽  
Reactive Sintering ◽  
Uniform Microstructure ◽  
Plasma Sintering ◽  
Average Grain Size ◽  
Spark Plasma

Y2Ti2O7 transparent ceramic was fabricated by reactive sintering using spark plasma sintering at 1673 K for 2.7 ks. The sintered body exhibited a cubic pyrochlore structure and uniform microstructure with an average grain size of 2.9 μm. The transmittance reached 73% at a wavelength of 2000 nm after annealing at 1023 K for 21.6 ks.

scholarly journals Development of calcium stabilized nitrogen rich α-sialon ceramics along the Si3N4:1/2Ca3N2:3AlN line using spark plasma sintering

2020 ◽  
Vol 9 (5) ◽  
pp. 606-616
Author(s):  
B. A. Ahmed ◽  
T. Laoui ◽  
A. S. Hakeem
Keyword(s):  
Spark Plasma Sintering ◽  
Single Phase ◽  
Sintering Temperature ◽  
Compositional Analysis ◽  
Physical And Mechanical Properties ◽  
Alkaline Metal ◽  
Maximum Hardness ◽  
Plasma Sintering ◽  
Alkaline Metal Cation ◽  
Spark Plasma

Abstract Calcium stabilized nitrogen rich sialon ceramics having a general formula of CaxSi12-2xAl2xN16 with x value (x is the solubility of cation Ca in α-sialon structure) in the range of 0.2–2.2 for compositions lying along the Si3N4:1/2Ca3N2:3AlN line were synthesized using nano/submicron size starting powder precursors and spark plasma sintering (SPS) technique. The development of calcium stabilized nitrogen rich sialon ceramics at a significantly low sintering temperature of 1500 °C (typically reported a temperature of 1700 °C or greater) remains to be the highlight of the present study. The SPS processed sialons were characterized for their microstructure, phase and compositional analysis, and physical and mechanical properties. Furthermore, a correlation was developed between the lattice parameters and the content (x) of the alkaline metal cation in the α-sialon phase. Well-densified single-phase nitrogen rich α-sialon ceramics were achieved in the range of 0.53(3) ⩽ x ⩽ 1.27(3). A nitrogen rich α-sialon sample possessing a maximum hardness of 22.4 GPa and fracture toughness of 6.1 MPa·m1/2 was developed.

scholarly journals Development of calcium stabilized nitrogen rich alpha-sialon ceramics along the Si3N4:1/2Ca3N2:3AlN line using spark plasma sintering

2020 ◽  
Author(s):  
Bilal Anjum Ahmed ◽  
Abbas Saeed Hakeem ◽  
Tahar Laoui
Keyword(s):  
Spark Plasma Sintering ◽  
Single Phase ◽  
Sintering Temperature ◽  
Compositional Analysis ◽  
Physical And Mechanical Properties ◽  
Alkaline Metal ◽  
Maximum Hardness ◽  
Plasma Sintering ◽  
Alkaline Metal Cation ◽  
Spark Plasma

Abstract Calcium stabilized nitrogen rich sialon ceramics having a general formula of CaxSi12-2xAl2xN16 with x value in the range of 0.2-2.2 for compositions lying along the Si3N4:1/2Ca3N2:3AlN line were synthesized using nano/submicron size starting powder precursors and spark plasma sintering (SPS) technique. The development of calcium stabilized nitrogen rich sialon ceramics at a significantly low sintering temperature of 1500°C (typically reported a temperature of 1700°C or greater) remains to be the highlight of the present study. The SPS processed sialons were characterized for their microstructure, phase and compositional analysis, physical and mechanical properties. Furthermore, a correlation was developed between the lattice parameters and the content (x) of the alkaline metal cation in the alpha-sialon phase. Well densified single-phase nitrogen rich alpha-sialon ceramics were achieved in the range of 0.53(3) ≤ x ≤ 1.27(3). A nitrogen rich alpha-sialon sample possessing a maximum hardness of 22.4 GPa and fracture toughness of 6.1 MPa.m1/2 was developed.

Fabrication Processes and Properties of Highly Pure MgAlON Materials

2007 ◽  
Vol 561-565 ◽  
pp. 543-546 ◽  
Author(s):  
Qing Huang ◽  
Yong Huang ◽  
Chang An Wang ◽  
Hou Xing Zhang
Keyword(s):  
Spark Plasma Sintering ◽  
Open Porosity ◽  
Single Phase ◽  
Bending Strength ◽  
Sintering Temperature ◽  
Hot Press ◽  
Plasma Sintering ◽  
Short Period ◽  
Spark Plasma ◽  
Hot Press Sintering

In this paper, the MgAlON ceramic was fabricated by Spark Plasma Sintering (SPS) and hot press sintering respectively. The results showed that highly pure and single-phase MgAlON could be fabricated at lower sintering temperature in a short period through SPS process, compared with the conventional Hot Press sintering (HP) process. The bending strength of MgAlON specimens prepared by SPS process was higher than 500MPa while bending strength of HP specimens was much lower. The open porosity was almost eliminated in SPS MgAlON specimens. Spark Plasma Sintered MgAlON had a single phase of MgAlON while Hot Press Sintered MgAlON had major MgAlON and minor AlN and Al2O3.

scholarly journals Development of calcium stabilized nitrogen rich alpha-sialon ceramics along the Si3N4-1/2Ca3N2:3AlN line using spark plasma sintering

2020 ◽  
Author(s):  
Bilal Anjum Ahmed ◽  
Abbas Saeed Hakeem ◽  
Tahar Laoui
Keyword(s):  
Spark Plasma Sintering ◽  
Single Phase ◽  
Sintering Temperature ◽  
Compositional Analysis ◽  
Physical And Mechanical Properties ◽  
Alkaline Metal ◽  
Maximum Hardness ◽  
Plasma Sintering ◽  
Alkaline Metal Cation ◽  
Spark Plasma

Abstract Calcium stabilized nitrogen rich sialon ceramics having a general formula of CaxSi12-2xAl2xN16 with x value in the range of 0.2-2.2 for compositions lying along the Si3N4-1/2Ca3N2:3AlN line were synthesized using nano/submicron size starting powder precursors and spark plasma sintering (SPS) technique. The development of calcium stabilized nitrogen rich sialon ceramics at a significantly low sintering temperature of 1500oC (typically reported temperature of 1700oC or greater) remains to be the highlight of the present study. The SPS processed sialons were characterized for their microstructure, phase and compositional analysis, physical and mechanical properties. Furthermore, a correlation was developed between the lattice parameters and the content (x) of alkaline metal cation in the alpha-sialon phase. Well densified single-phase nitrogen rich alpha-sialon ceramics were achieved in the range of 0.4 < x < 1.6. A nitrogen rich alpha-sialon sample possessing a maximum hardness of 22.4 GPa and fracture toughness of 6.1 MPa.m1/2 was developed.

Structure and Properties of Ti55Al45 Alloys Prepared by Mechanical Alloying and Spark Plasma Sintering

2011 ◽  
Vol 308-310 ◽  
pp. 2547-2550
Author(s):  
Yao Dong Liu ◽  
Jing Xing ◽  
Di Ai ◽  
Song Zhe Jin
Keyword(s):  
Grain Size ◽  
Spark Plasma Sintering ◽  
Sintering Temperature ◽  
Compaction Pressure ◽  
Al Alloy ◽  
Structure And Properties ◽  
Plasma Sintering ◽  
Conventional Sintering ◽  
Spark Plasma ◽  
Short Time

Amorphization and crystallization behaviors of Ti55Al45 powders during mechanical alloys (MA) and subsequent Spark Plasma Sintering are studied. It is found that the nanocrystallization process of the Ti-Al alloy proceeds and the sintering temperature can control the microstructure of alloy. The sintering of the compacts is carried out at the temperatures of 1100—1200°C with a compaction pressure of 30MPa and a heating rate of 30°C min-1. Specimens with high densities and approaching the equilibrium state can be obtained in short time of 180s by spark sintering than conventional sintering. Such shorter high temperature is important to prevent grain growth. The microstructures of the alloy contains equiaxed gamma TiAl with sub-micron grain size and small amount alpha Ti3Al phase.

Controlled Atmosphere Thermal Treatment for Pyrochlore Phase Elimination of PMN-PT/CFO Prepared by Spark Plasma Sintering

2014 ◽  
Vol 975 ◽  
pp. 274-279 ◽  
Author(s):  
Diego Seiti Fukano Viana ◽  
José Antônio Eiras ◽  
William Junior Nascimento ◽  
Fabio Luiz Zabotto ◽  
Ducinei Garcia
Keyword(s):  
Grain Size ◽  
Spark Plasma Sintering ◽  
Single Phase ◽  
Magnetoelectric Effect ◽  
Pyrochlore Phase ◽  
Practical Applications ◽  
Plasma Sintering ◽  
Average Grain Size ◽  
Spark Plasma ◽  
Phase Elimination

Multiferroics are interesting materials which present more than one ferroic property and have a great potential for practical applications [,,]. In addition, the coupling of magnetic and electric properties, the magnetoelectric effect (ME), offers news possibilities to applications [2,]. The magnetoelectric effect can be observed in single-phase materials like LuFe2O4, BiFeO3, etc. [1,] or in composites like PMN-PT/CFO, BaTiO3/CoFe2O4, etc. The ME composites have advantages over single-phase materials. They are easier to fabricate, less expensive, and have a wider range of working temperatures than single-phase materials []. However, some parameters that enhance the ME response need to be optimized. These parameters are the composition, the microstructure (grain size, grain orientation) and sintering parameters [6]. Thus, this work attempts to create a synthesis protocol to prepare the ME composite PMN-PT/CFO by Spark Plasma Sintering (SPS) keeping the average grain size as small as possible.

Microstructure and Physical Properties of Nanocrystalline Aluminum Consolidated by Spark Plasma Sintering

2015 ◽  
Vol 782 ◽  
pp. 102-106 ◽  
Author(s):  
Zhen Feng Liu ◽  
Zhao Hui Zhang ◽  
Yong Jun Sun ◽  
Fu Chi Wang
Keyword(s):  
Grain Size ◽  
Thermal Diffusivity ◽  
Physical Properties ◽  
Spark Plasma Sintering ◽  
Sintering Temperature ◽  
Initial Pressure ◽  
Raw Material ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Nanocrystalline Aluminum

Spark plasma sintering (SPS) technique was employed to fabricate nanocrystalline aluminum (Al) with the organic-coated Al nanopowders as raw material. A low initial pressure of 1 MPa and a high holding pressure of 300 MPa were used in the investigation. The effect of sintering temperature on the microstructure and the physical properties of the nanocrystalline Al was investigated. The results demonstrated that both the grain size and the thermal diffusivity of the nanocrystalline Al increase with an increase in sintering temperature. However, the resistivity of the nanocrystalline Al deceases with increasing sintering temperature.

Research on Two Sintered Techniques of Nanometer WC-Co Powder

2007 ◽  
Vol 534-536 ◽  
pp. 593-596 ◽  
Author(s):  
Lan Sun ◽  
Cheng Chang Jia ◽  
Hua Tang
Keyword(s):  
Grain Size ◽  
Grain Growth ◽  
Spark Plasma Sintering ◽  
Hot Pressing ◽  
Sintering Temperature ◽  
Grain Sizes ◽  
Sintering Time ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Hot Pressing Sintering

This paper concerned with SPS (spark plasma sintering), hot pressing of sinter nanometer WC-Co powder and discussed the density, hardness, microstructures and grain sizes of the alloys sintered by different styles. The results showed that SPS could lower the sintering temperature, increased the density and circumscribed the growth of grain size of WC. Hot pressing sintering could produce high density alloys and play well on the grain growth, but its sintering temperature and sintering time were larger than SPS. Besides, the hardness of the sintered cemented alloys that was dependent on the grain size and densification could also be improved by SPS and hot pressing.

Synthesis of FeAl Hetero-Nanostructured Bulk Parts via Spark Plasma Sintering of Milled Powder

2006 ◽  
Vol 980 ◽  
Author(s):  
Thierry Grosdidier ◽  
Gang Ji ◽  
Frédéric Bernard ◽  
Sébastien Launois
Keyword(s):  
Grain Size ◽  
Spark Plasma Sintering ◽  
Sintering Temperature ◽  
Milled Powder ◽  
Large Temperature ◽  
Proper Selection ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Strength And Ductility ◽  
Selection Of

AbstractSpark plasma sintering (SPS) has been used in order to introduce nanocrystalline grains within fully dense FeAl consolidated parts. Hetero-nanostructured parts, consisting of nano, ultrafine and micrometric grains, have been successfully processed when milled - Y2O3 reinforced - FeAl powder was used. The large temperature differences that are spontaneously generated during the SPS process as well as the use of milled powder account for the formation of such interesting structures. The grain size distribution - that is suggested to be very potent to improve both strength and ductility - could be significantly modified by a proper selection of sintering temperature and holding time.

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